Review on MAYASAF Universal Catalytic Converter Compliant Replacement Parts better for Exhaust & Emissions by Paul Walters

4 stars just because it failed the AU test. But for what you pay for, you get exactly what you expect. These general purpose catalytic converters are very affordable, but make no mistake, the quality of the metals used in them is NOT as efficient as any OEM version. Your vehicle will NOT pass the emissions test with this product. The downstream 02 sensors will surely notice this inefficiency and trigger the CEL (Check Engine Indicator). Code P0420 is the most common low catalyst efficiency code. In my particular situation, however, I didn't have to skip any outliers. test and my engine is also built and tuned in such a way that there is no longer a downstream 02 sensor. This cleared up the damp smelling exhaust a bit and muffled the exhaust rumble I was having. Overall I am happy with my purchase. I would recommend this for cars similar to my own situation. Carburettor or any performance-enhanced engine. This will help keep the air around the area safer, but it won't last as long either. Expect to change them after about 10,000 miles. power will not suffer. It's a big misleading myth that cats steal horsepower. On the dynamometer you can see the loss of 5 hp.